Improvement in concrete pavements



THORNTON SMITH, OF WASHINGTON, DISTRICT LOF COLUMBIA'. l

IMPROVEMENT IN CONCRETE PAVEMENTS.

Specification forming part of Letters Patent No. 87,007, dated 'February 16, 1869.

To all whom it may concer-n:

Be it known that' I. THORNTON SMITH, of

'\Vashington, i-n the county of lfVa-shington and 'a new combination of materials by which the construction of such pavements is cheapened materially; and also in making the pavements of streets, sidewz'dks, and gutters in one continuous piece, without the intervention of`curbstones.

The following description will enable persons skilled in the art to compound and construct such pavements. l i

',lhe concrete is formed from the following ingredients, inthe following proportions: Eighty parts of coarse gravel; live parts ot'sharp sand; tive parts of pine-tar; iive parts ot' gas-tar; two parts of coal-ashes; two parts of cinders; one part ot' hydraulic cement.v lhe above ingredients are combined inthe proportions stated, or in substantiallysueh proportions, and,'when mixed into a mortar, they are spread'upon the surface ofthe ground to be paved, which should lirst be prop-n erly prepared to receive the pavement, to a proper depth, according to the cha raeterof wear to which it is to be subjected, and then rolled withaheavy roller` until the concrete-bed is made solid .and

smooth. Y

This pavement is cheap of construction, and,

while possessing greatv solidity, it is also sufficiently elastic. It is impenetrable by water,`is

not subject to decay, is not a-ii'ected by either cold or heat within ordinary climatic ranges, and has no disagreeable odor of bitumen even in the hottest days of summer. l ain aware that other concrete pavements have vbeen compounded, or proposed-to be compoui'nt,`

ed, containing some or all of the above ingredt, ent-s, and l do not claim 4that any of them are new; but I Aam not awarethatany pavement has been made of these ingredients alone. `Where prepared to. be used it has been always in differ# cnt proportions and in combination with otherV ingredients, which, while adding considera-bly to the cost, are not necessary to the proper composition ofthe concrete.'

I propose, also, to make the sidewalks, gutters, vand street of one continuous sheet ot' concrete,

without the intervention of curbstones, as shown in the drawing. What l claim, then, as my invention, and deto thisgspecification in the presence of two sub,

Scribing witnesses.

, THORNTON SMITH. Witnesses z 1). l". HOLLOWAY,

A. Moons. 

